. >>> a woman is facing charges after a security breach at a city school. the woman forced her way into the national academy preparatory school carrying a birthday cake. she did not have permission and during a fight with a staff member she pulled out a knife. the staff member suffered minor injuries. >>> today maryland stay police have welcomed new members to the force. 10 dogs have graduate from the k-9 unit. they trained over the last couple of months. the k-9s were all hand selected. >>> stay with wjz 13, maryland's news station. up next, how some schools across the country are stepping up security. residents in colorado,,,,,, >>> welcome back to "cbs this morning." schools opened as usual across the country on monday morning. as you can imagine, the newtown shooting was on the minds of many. >> many teachers from westchester county shared the details of getting back to work after a very difficult weekend. >> reporter: when students returned to school on monday, educators prepared to take tough questions from children and offer comfort to anxious parent